Tack-pulling machine



F. H. THOMPSON. TACK PULLING MACHINE. APPUCATION FILED JUNEH, 19w.

Patented Apr- 12, 1921.

In V872 tor 6,74

FRANK H. THOMPSON, 0F BEVE MACHINERY CORPORATION, OF

NEW JERSEY.

ELY, MASSACHUSETTS, ASSIG'NQR T0 UNITED SHOE IPATEBISGN, NEW" JERSEY, A CORPORATION OF TACK-PULLING MACHINE.

Specification of Letters .Eatent.

Patented Apr. 12, 1921.

Application filed June 11, 1919. Serial No. 303,283.

To all to ham it may concern: W

Be it known that I, FRANK n. THOMPSON, a citizen of the United States, res1d1ng at Beverly, in t of Massachusetts,

he county of Essex and State have invented certain new and useful Improvements in Tack-Pulling Machines; and I do hereby declare the following to be a full, clear,

and exact description of the invention, such as will enable others skilled appertains to in the art to which it make and use the same.

The invention relates to tack pulling machines,

and more particularly of machine in which the tack to that type is pulled by the tack pulling jaws are secured or formed on the tree ends of a pair of jaw carrying levers, which are pivoted to a pair of swinging links and are connected at their other ends with two oppositely rotating cranks.

This aifords nism for giving the jaws a simple and compact mechathe proper tack engaging and pulling movements, which is well adapted for operation at the highest speed consistent with the proper operation on the tacks.

It also enables the jaw to be closed upon the tack while moving at comp aratively low speed and to pull the tack while moving at comparatively high speed.

The invention will be readily understood from an inspection of the accompanying drawing and the following detailed descrip tion of the mechanism described therein.

In the drawing, the mechanism embodying the invention in its preferred form is shown in elevation.

In the machine shown in the dI'ZLWlII the tack pulling jaws 2 are formed on the lower or free ends 01' two jaw carrying levers {i which are oppositely curved and cross one another lmmediately above the jaws. The levers are connected immediately above the crossing point to two oppositely swinging links 6 which are mounted on the supporting head 8. The

jaw carrying pins 10 carried upper ends of the levers are connected to crank by two oppositely rotating and intermeshing gears 12.

Work supporting plates 14c are arranged to underlie the jaws 2 and are spaced to provide a slot in which the tacks may be positioned w hen the shoe is held against the work supporting plates, as indicated in the drawing.

T he jaw carrying levers, links and cranks are so arranged that the tack pulling jaws are given the path of movement indicated by the dotted lines in the drawing. The jaws move toward each other to engage a tack when they are close to the work supporting plates and when the cranks are moving in a substantially horizontal direction so that the jaws will have at this time a speed about one third that of the cranks. After the jaws have engaged the tack, they move in vertical parallel paths while the cranks are moving vertically so that at this time they have substantially the same speed as the cranks. They are then separated to release and discharge the tack, after which they are returned to position close to the work supporting plates and again brought together to engage a tack positioned between them.

What is claimed is:

1. A tack pulling machine, comprising a pair of levers, oppositely rotating cranks connected to the ends of the levers, a tack pulling jaw supported upon the opposite end of each lever and a swinging link connected to each lever intermediate its ends.

2. A tack pulling machine, comprising a pair of levers, a crank connected to one end of each lever, means for rotating the cranks in opposite directions at the same speed, a jaw supported upon the opposite end of each lever and a swinging link connected to each lever intermediate its ends.

3. A tack pulling machine, comprising a pair of levers, a rotary crank connected to one end of each lever, means for rotating the cranks in opposite directions, a swinging link supporting each lever intermediate its ends, and a tack pulling jaw supported upon the free end of each lever, the jaws being constructed and arranged to move in substantially parallel paths to pull the tack.

4L. A tack pulling machine, comprising a pair of opposed tack pulling jaws and means for actuating the jaws to first engage with opposite sides of the tack, to next move in parallel paths to pull the tack and finally to separate to disengage the tack, and mechanism for moving the jaws in the above described paths consisting of jaw carryin levers, oppositely rotating cranks connected 6. A tack pulling machine, comprising a pair of work engaging members adapted to receive the tack between them, a pair of levers a tack pulling jaw carried upon the free end of each lever, a crank connected to the opposite end of each lever, means for rotating the cranks in opposite directions and an oscillatory link connected to each lever intermediate its ends.

FRANK H. THOMPSON. 

